Write a computer program for computing the histogram of an image.

编写一个能计算一张图像直方图的程序。

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At the same time, the computer can calculate the percent of pass and the rejection ration, and display the quality fluctuation gram, the quality control figure, histogram.

同时计算出产品的合格率和废品率，并画出质量波动图、质量控制图、直方图。

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At the same time, the computer can calculate the percent of pass and the rejection ration, and display the quality fluctuation gram, the quality control figure, histogram.

同时计算出产品的合格率和废品率，并画出质量波动图、质量控制图、直方图。

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